Instagram is a centralized social network that requires the use of proprietary software. It's almost impossible to use Instagram without giving up your privacy or freedom... unless we use another front-end, such as Bibliogram, which I describe in this article.
Bibliogram allows consulting user profiles, posts and IGTV videos in a simple way. In the home page, there are search forms for both posts and users.
Because it's free software, you can install Bibliogram in your server (if you have one) or use the public instances of other people.